Bag



` Sept. 29, 1959 R. J. wlLLlAMs I '-2,906446 BAG Filed Aug. 18, 1858United States Patent O F Bag Company, St. Louis, Mo., a corporation ofMis- Soul'l 'AppliaonAugust 18, 1958, serial No. 755,715

i sclaim. 7(c1. 229-625) This vinventio'n relates. tolbags, and moreparticularly to pasted valve 'bags' such as' are used for finely dividedor pulverized materials (fertilizer, for example) ,and which are filledbytrneans of a filling spout'received in the valve.

Among the several objects of the inventionfmay be:

noted the provision of a pasted valve bag of theclass de;

scribed having an improved valve construction including a novelsleevewhich permitsfree flow of material from the filling spout into thebag so as to avoid clogging, and which provides for 4tight closure ofthe bag upon removal from the filling spout after the bag has beenfilled; the provision of a valve .construction such as describedin whichthelsleev'e includes a special check valve member which is adapted topermit the stated freeflow of material into the bag during the fillingof the bag and which closes when the bag has been filled; and theprovision of a bag with a valve construction having the statedcharacteristics which is economical to manufacture. Other objectsandfeatures will be in part apparent and in part pointed out hereinafter.

The invention accordingly comprises the constructions hereinafterdescribed, the scope 'of the invention being indicated in the following'claimsi n In the accompanying drawings, in which one of variouspossible embodiments of the invention is illustrated,

Fig. 1 is a perspective view of a pasted valve 'bag in which theinvention is incorporated, the bag appearing as if filled;

Fig. 2 is a plan viewof the valve corner portion of the bag, parts beingshown in a condition -assfumed during the formation of the closure;

Fig. 3 is a perspective view of the valve; corner portion of the bagwith certain side flaps opened up better to show the construction; and

Fig. 4 is a perspective view of the valve sleeve per se as it appearswhen viewed from its bottom.

Corresponding reference characters indicate corresponding partsthroughout the several views of the drawmgs.

Referring to the drawings, there is indicated at 1 in Figs. 1-3 a pastedmultiwall paper bag provided with va valve of this invention. As will beunderstood by those skilled in the art, such bags are usually made bysegmenting a continuous length of multiwall bag tubing into individualbag tubes, and providng each such tube with a pasted closure at eachend, for example a diamond fold type of closure. Fig. 1 illustrates theclosure 3 at the valve end of the bag. As appears in Figs. 1-3, theclosure comprises side fiaps 5 and 7 and inwardly directed end fiaps 9and 11. End flap 9 is the end flap at the valve corner of the bag. Informing the closure 3, the side flap 5 is folded over upon a transversefold line 13 to overlie the end fiaps, and the side flap 7 is foldedover upon a transverse fold line 15 to overlap the side flap 5. Apattern of paste such as ndicated at P is applied to accomplish pastingof side flap 5 to end flap 11 (the end flap opposite the valve corner)and pasting of side completedsleeve) into the form of a flattened tube.One

2,906,448 Patented Sept. 29, 1959 ice . flap 7 to sideflap 5. Each sideflap, as folded over, includes portions of the endrfiaps, such asportions 9a and 9b of end flap 9. a

'In accordance with this invention, a special valve sleeve S of thisinventon is applied to end flap 9 prior to theV folding over of the sidefiaps and becomes incorporated in the closure 3, projecting inward fromend flap 9 into the bag, Sleeve S is constituted by a rectangularpieceof flexible material, such as `ltraft paper, folded on foldV lines17 and 19 (which extend lengthwise of the w i wall of the flat tubularsleeve S is constituted by the portion of the piece of material lyingbetween fold lines 17 and 19 and is designated 21. The other wall of theflattubular sleeve S is constituted by the portion 23 of the piece ofmaterial lying between fold line 17 and edge ,25

of'the piece' of material, and by -the portion 27 of the piece 'ofmaterial lying between lfold'line 19 and the edge 22 ,of the piece ofmaterial. Portion 23 is wider than portion 27 andoverlaps the latter onthe outside thereof.

e The width of portion 27 is preferably half the total width ofthesleeve so that the edge 29 is located centrally inL respect to thewidth of the sleeve. The lapping side marginsiof the piece of materialare specially designated 23a and 27a, 23a being a part of portionV 23and 27a being. a part of portion 27, 23a being on the outside of 27a.

Margin 23a is provided with a slit 31 extending transversely fromitsedge 25. The length of the slit, as shown, corresponds generally tothe width of the lapping margins ,I 23a and 27a, Margins 23a and 27a areshown as being securedv together by paste at 33 from the slit 31 to oneo. the other end 37 (the inner end) of the sleeve, margin 23ajis`free ofmargin 27a, and this fre portjion of the margii'1`23'a constitut'esalcheck .valve flap 'design'ated F.

v'The sleeve S, made |as abovefdescrbed, 'is'fapplied to the outside ofend flap 9 with the wll of the vsleeve constituted by portions 23 and 27facing toward the end -flap 9, with 'slit 31 located slightly inwardfrom the inner-end edge 39 of the end flap 9, with the end 35 of thesleeve positioned on the flap 9 outward of the end edges of side flaps 5and 7 and the portion of the sleeve from slit 31 to the end 37 of thesleeve projecting inward from the inner end edge 39 of end flap 9. Thewidth of th'e sleeve corresponds to the width of the pasted closure asdetermined by the distance between the fold lines 13 and 15 of theclosure. The sleeve is pasted to end flap 9 by paste P, and the patternof paste P is such that side flap 5 (including portion 9a of flap 9)becomes pasted to wall 21 of the sleeve.

The sleeve S is adapted to receive a filling spout for filling the bag,spreading open upon insertion of a spout therein. The material deliveredthrough the spout flows freely into the bag through the sleeve in 'thedirection of the length of the sleeve and also in a lateral directionwith respect to the length of the sleeve (downward into the bag), theflap F opening up away from margin 27a to provide an opening betweenedge 29`and the flap F for such lateral flow. When the bag has beenfilled and is taken off the spout, the sleeve flattens out and flap F ispressed against margin 27a by the bag contents to close ofi the openingand prevent escape of material.

It is preferable that the lapping margins 23a and 27a,

be pasted together at 33 in the region lying outward, from the slit 31in order to prevent the inner margin 27a from curling up away from themargin 23a and hanging up on the spout, but it is not essential thatthese margins be so pasted together, and the paste at 33 may in someinstances be omitted.

As various changes could be made in the above con-V structions withoutdeparting from the'sco'pe of the inven-f tion, it is intended that allmatter contained in the above description or shown in the'accompanyingdrawings shall be interpreted as illus'trative and not'tin alimitingsense.

I clam: I 1. A bag having a closure atone end and provided With a valveat one corner at said end,`"said closure having an' inwardly directedend flap at said Yalvecorner and said valve comprising a flexible sleevesecured to and proecting inward from said end flap,rsaidl sleevebeingc'onstituted by a piece of flexible material folded into the'rformof a flattened tube in which one side margin of the piece of materialove'rlaps the other side margin and lies on the outside of said othermargin, said sleeve being'adapted to receive a filling spout for filling-the bag, and spreading open upon insertion of a spout therein, saidlapping mar'- gins being located in one wall of said sleeve and saidwall being secured to the outside of said end flap,`sad onemarginhavingl a slit extending transversely from the edge thereof, saidslit being located between the innerl end edge of said end flap and theinner end of sleeve, the portion'of said one margin which extends fromsaid slit into the bag constituting a' check valve flap adapted to openup away from the otherV margin upon inserting a filling spout in thesleeve and upon delivery of material through the spout into the bag forpermitting flow of material between the said margins, said check valveflap being adapted to close back over said other margin upon 5. A paperbag having a pasted closure at one end and provided with a valve at onecorner at said' end, said closure having an inwardly drected end flap atsaid valve corner, a first side flap overlying said end flap, and asecond side flap overlying and pasted to said first side flap, saidvalve comprising a flexible sleeve pasted to and projecting inward fromsaid end flap, said sleeve being constltuted by a piece of flexible.material folded into the form of a flattened tube in which one sidemargin of the piece of material'overlaps the other side margin and lieson the outside of said other side margin, said sleeve being adapted toreceive a filling spout for filling the bag, and spreading open uponinsertion of a spout therein, said lapping margins being located inl onewall of said sleeve, the outer end portion of the sleeve'lying betweensaid end flap and said first side flap with said one wall of the sleevepasted to the end fiap and the other wall of the sleeve pasted to saidfirst side flap, said one margin having a slit extending transverselyfrom theedge thereof, said slit being located between the inner end edgeof said end flap and the inner end of the sleeve, the portion of saidone margin which extends from said slit into the bag constituting acheck valve flap adapted to open upaway from the other margin uponinserting a filling spout in the flattening out of the sleeveafterwithdrawal of the spoutV when the bag has been filled.

2. A bag as set forth in clam 1 n which the edge of said other margin islocated centrally in respect to the width of the sleeve.

3. A bag as set forth in clairn 1 in which the margins are securedtogether outward of the slit.

4. A bag as set forth in clam 1 in which the edge of said other marginis located centrally in respect to the width of the sleeve and in whichthe margins are pasted together outward of the slit.

sleeve and upon delivery of material through the spout into the bag forpermitting lateral flow of material between the said margins, said checkvalve flap being adapted to close back over said other margin uponfiattening out of the sleeve after withdrawal of the spout when the baghas been filled.

` 6. A paper bag as set forth in clam 5 in which the edge of said othermargin is located centrally in respect to the width of the sleeve.

7. A paper bag as set forth in clam S'in which the margns are securedtogether outward of the slit.

8. A paper bag as set forth in clairn 5 in which the edge of said othermargin is located centrally in respect to the width of the sleeve and in`which the margins are pasted together outward of the slit.

No references cited.

